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Topological Optimization of a Dental Prosthesis

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Topological Optimization of a Dental Prosthesis

  1. 1. Dipartimento di Ingegneria Meccanica e AerospazialeProf. Massimiliano AVALLEDr. Alessandro SCATTINADr. Paolo C. PRIARONEMarco BELLANDA, MDTopological Optimization of aDental Prosthesis2013 European Altair Technology Conference
  2. 2. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Aim of the bridge– Fix the prosthesis attached to the mandibulaIntroduction
  3. 3. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConferenceIntroductionMandibula model(metal) bridgeArtificial gingiva
  4. 4. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConferenceIntroduction Aim of the project– The problem:•excessive heigth and weight of theprostheses = patient’s discomfort– The (possible) solution:•To lighten the bridge by– Using lightweight materials– Applying optimization
  5. 5. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Parametric optimization– The shape is given, parameters like thickness, are changedto obtain the objective Shape optimization– The shape is changed to obtain the optimization Topological optimization– Only a volumetric constraint is givenleaving the optimization algorithmfree to find the optimal solutionby removing useless materialOptimization methodologies
  6. 6. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Minimum bridge width Fixation points– Usually 4 to 6depending on thepatient Material Golden alloy Chromium/cobalt alloy Titanium alloys CompositesTopological Optimization: problem definition?
  7. 7. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference In biomedical applications, each product ispersonalized on the basis of the patientModel definition3D facets and tetrahedralelements reconstructionCT scans
  8. 8. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Simulation of the atrophy of the mandibulaafter damaged teeth removalModel definition
  9. 9. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference 3 analyzed casesControl Volume DefinitionLarge control volumeLight control volumeOptimized control volume
  10. 10. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConferenceControl Volume DefinitionLarge controlvolumeLight controlvolumeOptimized controlvolume3 analyzed cases
  11. 11. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Boundary conditions– Boundary conditions are essential in thetopological optimization– Constraints: fixation points– Loads: bite loads?Topological Optimization: problem definitionMain biting modes
  12. 12. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Boundary conditions– Loads: bite loadsTopological Optimization: problem definition
  13. 13. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Boundary conditions– Loads: bite loadsTopological Optimization: problem definitionThree different load cases havebeen examined: Point loads Pressure loads Wrench equivalent load
  14. 14. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Pressure loading modeTopological optimization resultsLarge control volumeLight control volume
  15. 15. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Point loading modeTopological optimization resultsLarge control volumeLight control volumeLight control volume
  16. 16. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Additional volume constraintControl Volume DefinitionFixed volume (red)Study volume (blue)
  17. 17. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Results with additional volume constraintsTopological optimization results60% weight andvolume reduction
  18. 18. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConference Results with additional volume constraintsTopological optimization resultsVon Mises StressDisplacements
  19. 19. Dipartimento di Ingegneria Meccanica e Aerospaziale2013EuropeanTechnologyConferenceConclusions The topological optimization method implemented in OPTISTRUCT wasefficiently applied to the improvement of a dental surgery prosthesis The objective was to reduce the volume and weight of a dental bridge,usually a massive metal (gold or titanium) structure The biggest problem is related to the loading mode: few and incompleteinformation are available, the different loading modes are only known asrough estimates Another difficulty is related to the variability of the problem: each patientis a single different case, and should be treated as an individualoptimization problem Despite the difficulty a reduction of 60% in weight and volume wasachieved: a verification by experimental tests (on a real patient) is beingcarried out.
  20. 20. Dipartimento di Ingegneria Meccanica e AerospazialeThank you for the attentionTopological Optimization of aDental Prosthesis2013 European Altair Technology ConferenceProf. Massimiliano AVALLEDr. Alessandro SCATTINADr. Paolo C. PRIARONEMarco BELLANDA, MD

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